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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3b61aa629f02f13386b763ba3936b6b9d65169271aea51cb74a85f5556908e' 
  AND token = 'zYJO/RgvoXNFTk4izv10WVCCFxFddVi9XSYWzmkLrRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}