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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bead554dd9f2e1793026910f925273a72abcea25347e5f7b938d8159968bd256' 
  AND token = 'OxG6eo5BA2e9ZDM0g1132g/u/i0Ga+DwisGRrWeq6Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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