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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcd99cea80558c00d80b9e7cd8ab757f0cff148ec8268c54ea38e1cf3e8cf9d' 
  AND token = 'Fxg65bPOanuKGc7RmqW7YJzTaRYjv5767QutcwXuucM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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