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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ae84f01ac860e93b53b15f03d40874e381a0e59f0f43b45ebfca5fc2a6a83c' 
  AND token = 'srTbAC9sMsb9dQ/OBnGDKOYaEE+WNluoqmhaiiBjn8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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