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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fae76b58848dfc98511d9cb578d0879d788c1573c0050d71f746a8a32d06c0e' 
  AND token = 'lz3ku78mbs7MCl13MNSugxczkF5Mx090AVcHRu2xgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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