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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aa8fff4c12d88a4da361ba5baafafef57457a6e0efe3ed589518cc56c72f12' 
  AND token = 'Km+fCbrfAm3RyIibq2xj2dhtBsY9KRO1fzgUMIoIPjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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