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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0966deb1a40fba3f7d63c5cfa7a217e296fdcb13e39f1cef7a9ccf6ad8fee3f0' 
  AND token = '23uC203zyBYoKxuWNmzMbELnxhVa5wETIqO5Mvg+a28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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