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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfe7a39849020a1e29bcb7f5df7fe7829176fdb52c85a7930a448d934fd52d6' 
  AND token = 'ynwNWDl4E7A5ty8AOg7DkWj4bcZrVFjNShoQYid8zyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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