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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7e06bcef1035bb08cf6772da9d32b3319c871d620a9ed5a27c3bd04708e67b' 
  AND token = 'xVcBU+HpZBKhG6NWE2uRiYFt6NNoA8KQiO9wZH9Rlbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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