SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cd652dc92f7e41f1932d74b8cf00177282c7fe88cb4f9d186b09f3f8028985' 
  AND token = 'FMdhch2v0gHyJfF8nQjD/pNpNtUmwYUgvG+FTsal7Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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