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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7779411fa8c680fc01f2d9c0dcc5f8f877dc003f02d4d35661adbee419975b' 
  AND token = '+2uWUZUa34A8eN45SGbF6bc7K/j2VC6c5DzzXzOuYZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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