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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c582dffd4cee8084340a16a13b1685f5f751beb2bbe5bfa5b6f57e4a9045f8' 
  AND token = 'zI4m6Tq20RQHo7hUNUry5sf0DoTjff6cwKjVNI/EE00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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