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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb8e7dbd33133d62f2711611f605f96540e824c52441e88ddc7c178d71ec9f8' 
  AND token = 'nI83MXQCMwRD/7pRRw6q17vwdy5m+LDE6IIof5LFqO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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