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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed1f77f9f02dc27ea67ab5809b5338b53ebfd02d4df1fa783ebfa36157547df' 
  AND token = 'vddFDqybhSs7Zpbw7MaMjzDzCbecXGgeejw95wtbZJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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