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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbdeac081a1c2efb28e55a2add325d1c1f9b5199901b4de51ebcc98990ed301' 
  AND token = 'gZTyCi+D7tkI9fZXuymzBqgmoF8a1FqgKVuPunFhKeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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