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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fbacdccd283e9a22112c332f7fa63240f79ec59c1fe76eabe02593454a55de' 
  AND token = 'eNQq8azjXUJyXp8kqtIxI0gEmGgnhT0M2+/4vyE7z2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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