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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99a066bfd7f6dcd7ed7ad0bfd4e26d3d56f5144b4cfa28a120d555f83b2a0f1' 
  AND token = 'm2yUN4Fr3zVKM5KrPcFpd17pgUBqhQIOPSEPqHR4Z/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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