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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ba38f2f912abb779b3144231d960916e9773ed46066525f9a3ec482bfd878c' 
  AND token = 'Is/Vh5Kw9Em9MtcaAE36lUzII6g8kajNOIbrtoBwt48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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