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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8f5bc27c8f54c8a981cd5950d091cbcd359acd59ab07c12e0d960075f34525' 
  AND token = 'scTfFCKFjGa/tgBLAlCK81dn6Xk6SJEHE+u12OOpoS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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