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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426eb86564f8172d3af980e79baccf3922c69640923ffecc8ecdcf0aed6e07a5' 
  AND token = 'jS8HAtXQPeC5Z5KwenaRJMbY3CjFasNXzqOt6cfw3Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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