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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4b896919809334b32d349fb3549b63ba30e779bb8d986fc48f4c1f4e602ce3' 
  AND token = '67KKj2/l17wY18WWZu391KgkL3VaIz4uIdeAGiNcsEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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