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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7733267c15fedcd08c74f6c52f7f55855d34f6b1cac26fb683511d1ae028dea' 
  AND token = 'TpObbW70pIy/oWH8NFJwIQK9VG/ggoXYAdQp8gj4bK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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