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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b18b6ccb17485b1178567e4f629e8606e76844feee4ef9ca406bca512e7aeaa' 
  AND token = 'l3xzfnSfIbM/WXmwVqqS5lHpCru3fg6ncN2dGW6+46g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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