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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113f9fc33dc65eca4da3171b6c715e65402e0bd6c15d75124bbc3dc4030937ff' 
  AND token = 'qsLGDAn0jVy57DWEZWf/duTew65qZXMOoGdfWdEwT+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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