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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d517ba1ff9b19766718f7a97d30d03e48f45f053f3605b344d7e0bd8609220f' 
  AND token = 'tTmJBgdOU6Gikoy8ESO62YcIM1zGqQPv6u9Kfw125r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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