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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa97e59d89bbae025a4ff8e8ebe208ed9f63990a975c87725953afd0a441abef' 
  AND token = 'E9G2HrvaNu8Smq0OCfymTMXKpY+tYlKcfW96N/tC6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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