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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6af60633fcc00bec8a8fd2fa025ec5dbe771a11757f7a9523c9bfb64edd2fc' 
  AND token = 'D2YRbt0q00NwtoFPIbuCMa9bgMDjvKs31VMeC3Jlqh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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