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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb744c21b0f4ddf558fdbada9e40da0a5e02420fdf540e8dfa653ee2f145c299' 
  AND token = 'lIT355A06nPH19OHU1yXCF9QLKu6QyYbzYUpU3F3c4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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