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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92966380ebb19879d4304ecae31beadca9f7e17078c906b79b03b703c2d01e8' 
  AND token = '6VYROAZbDuadER7kTFSVygKX4hwnQVe2Ue2c7Ftiboc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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