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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4dc5c793879e1ce4ce50d8116dd7dbc4a8fb891e00ca4a7834f4886c3af8ec' 
  AND token = 'cUJIJeUYxYM3ojVSwciN8ZfAzkTr7TRevK9sMH/wIxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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