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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538eb57a4a0408a3fe8bb31542d33addef02a8648f5ea3464017ee464b7a49e6' 
  AND token = 'pp10nlvkxbgbc8/P3J6WAyORfw9fCk03Znw6XjRF/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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