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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c3856401414783ef646237a3dbaf0620dc64e2f2aee08316c71260575b7da4' 
  AND token = 'lFVXmcU7CsqciiUafS2GxyiBX5TT6MgUfqGRITk47kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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