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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112f887c67331eb4c2e6aab192e03f1c3a55b52c4e6a98175c6746a9c091aa95' 
  AND token = 'tegt6v4ss7ZY6yBgCOAdrKXHO5xcLP2RlNynI0pJ92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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