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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531b74f821bf9550c5769d85266584739347363e2a973656831566ae6384e569' 
  AND token = 'RvaQJyF7fGfIuhz5jfSwCJuJ86IBhoqu4fi1hk5Mf/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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