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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dafc2fe13c2f751be4a5d799833a673f8700bd5b0071e9f58ea01afedaaafd' 
  AND token = '3nckiBI2TMYF9rruBXhDFY/b34fRHlWA1RcPjPR/X+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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