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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9be2188f1725ed3c807f5f654c649d45100390befddd9ef749df06c73f4594e' 
  AND token = 'qIXlbtAdHj+2OlCen6IVqF0JBwAxJ4+7bUTja2jkhks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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