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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9e1355f18548c71392f76b7396c8da6421c07a168b30f4a4e5086138e0442e' 
  AND token = 'nwZtdl34/0Xi40oVbBk8iDig9Dm3c8Xm6ikGLk09TiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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