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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16b4d4346c6c301164f87affc8e367a5b7e5ce041d33ecf6b8a24d4d2d27819' 
  AND token = 'Ci4uhv7fLg1Wrl5BuBLdmIncDXfxOW+UvuEhx4Ntt1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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