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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99feeb3da79e71056738612c181f1a6fd668b2a1b5df5507c195e87044eccad' 
  AND token = 'qI9cd7SQ3LBGfzUwg1dFtUr9d1kx6nlbsIFXctSOjSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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