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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f5e8046c3404c349454bb1344f8a491004cac8ce3c96a2e3d65a958191cd96' 
  AND token = 'UajfUGER3++5EONHL2rQQOPAJC4IiYazw5w+ZklBrBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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