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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab40f393fb5ff3bd1f073075fb1e81da34fede7970e4f6c15bfb90d4033ce772' 
  AND token = 'rs7uKiHgblZX9MqhWEL1hz0N17xwiEzE38o5SperBXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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