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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a7a09ec12d9260728368d14de8520d5bd33eb1e46e0577e25f23d69211182d' 
  AND token = 'G+Sg4Euk+t9Go1e+9y6/0NPywgy7k4a54C2+/L08Wxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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