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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3d7f7c050b45572321e8213e3662ac4462b84b50fe9056cc4f85f17219eadf' 
  AND token = '/7/HCGOiyg+UpWed2WZsv5XR5m7Q5h32ESVJeruGeCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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