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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f112e30c77c6df4b5f8b6ef9b8bf15556acb3857f59b4f408fb88f8a336e6d' 
  AND token = '0KIT99kf+H7h1yk74GDi7rHo15JXn3OXphctxAJTbhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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