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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bde12fdd600541ddd5db3334fdbc57777d5ecf6200ffee22736d5932101711' 
  AND token = 'Fpd01kzGN1ejXIgznIx5j0VbKu2obm661rZvRSxyxW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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