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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95f59cdb6895e2341033b044b8713f29f88601d9c934719e5845a5f72dbf616' 
  AND token = 'bwF2SrhjOBxxv3o7U9Ssey49/fuNX++o3/iMH7MlFfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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