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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8941481e84a5ce22d3ff803f27fdcf5b23e13e5360f0e116c04d59072bfbad93' 
  AND token = 'CUL4IerBbzIMidP4K6/zZ/p3alhZUt7DthSIK9LhNU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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