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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9f0bbf792d10c719becd132066a2f76cdd8aee170fc1aee60cd7b844c40fe9' 
  AND token = 'inFeVaY4Tse0gHh7J1QGr+U/Rx+a+O3QC6OhoL+DoUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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