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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255f08775fc56f4f6897481ca94fb3a2d7e8a3068dfb4b8103e67095fa1db9f1' 
  AND token = 'zQo9XU0zcy1glr6Q2/N/LsK6ZIsO84c6895zYA65ujg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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