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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddafd74aa16e5d3d6c04b55683906114e244e228119f52b3f5d54b5157538f0' 
  AND token = 'kP7NxnFcu4hIFa3o/mhap1K0W0JS3A/n7hFHWtiq6jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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