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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae71057bbcf73af60bb9460c5ff79bbe08159613866134e105c95255a711255' 
  AND token = 'gDfgTWE7VpyEn7O0WiQB0UHS3EOPhomu59KD2jYrMZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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