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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad39127d7d8fc8421d0c89aaabd7bb2887e799df5f97ecb7979d129598e856e7' 
  AND token = 'fJ1WkxPoDOaX7x1FgokHsltOZfVPIXkE+h3wsJPxsPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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