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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf3b39bb625f37b4bf25b0c3ce2f20f568434fdb4cce954cf4921bf153e335c' 
  AND token = 'oLwrml6uK+/HO5FxxFmTWoDynPfcJi8bhIuyev58g+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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