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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23f4a740fa9e728e156c6438738dcfce2d8a9e5d7e58e511ab684db7fe3e852' 
  AND token = 'KUX+22uwRtvm5Ak87fFhOFpq3z7ifZRU+wp1e8GWhx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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