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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c8d6d3b6808d04986e11a0eadd760c88734dc35e7b7137e7b424d740fa9930' 
  AND token = 'UrYpX7jMnxz1Imu5fc1obrNF43dVIQ3NUnvH7ZDRQPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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