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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cda58f0d7405d6fed61f8ca42236d63c1fe3ed4999eb490df0e5c355710499' 
  AND token = 'XoAjb+XOGr8AqxwGiugQRvPggoon6bieLgphMJfPFRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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