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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7de3474817aa25e76163ed3ac2907fa62da56bfafce5d0bcc2512974c2b4cd4' 
  AND token = 'YPl8Xov9iFu28Red31UuYcnE0NRgx0ujm+43QvO/mww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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